GATE ME 2019 Set 1 — Question 22
Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.MCQ+1 / -0.33MediumVapour Compression CycleRefrigeration & Air ConditioningThermodynamicsCoefficient of Performance
Thermodynamics → Refrigeration & Air Conditioning → Coefficient of Performance
Last updated
Question
Consider an ideal vapor compression refrigeration cycle. If the throttling process is replaced by an isentropic expansion process, keeping all the other processes unchanged, which one of the following statements is true for the modified cycle?
Correct answer
(A) Coefficient of performance is higher than that of the original cycle.
Solution
In a standard vapor compression refrigeration cycle (VCRS), the expansion process is a throttling process, which is isenthalpic (). If this is replaced by an isentropic expansion process (), the enthalpy at the end of expansion () will be lower than . This results in two improvements:
1.The refrigerating effect () increases because .
2.The expander produces work output (), which can be used to reduce the net work input required for the cycle ().
Since , an increase in and a decrease in both contribute to a higher Coefficient of Performance (COP).Continue learning with Success Tracker
A step still unclear? Work through it with support
Use Success Tracker to ask about the reasoning, then try another GATE ME question to check your understanding.
AI-powered practice· Unlimited practice on eligible plans
- PYQs with solutions
- Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
- Practice that adapts
- Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
- AI doubt support
- Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.
Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.
This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.
More questions on Refrigeration & Air Conditioning
2026 Set 1 Q23For an ideal gas, starting from state point 1, two different processes take place. The…2026 Set 1 Q28For the isothermal expansion of an ideal gas in a piston cylinder system, the net heat supplied…2026 Set 1 Q44For an ideal regenerative Rankine cycle, as shown in the figure below, which one of the following…2026 Set 1 Q56A liquid comes out of the reactor of a chemical plant at temperature…2026 Set 1 Q57A rigid closed vertical cylindrical vessel of diameter contains …